1. College Physics

Two forces, F⃗ 1 and F⃗ 2, act at a point, as shown in the picture. (Figure 1) F⃗ 1 has a magnitude of 8.20N and is directed at an angle of α = 55.0∘ above the negative x axis in the second quadrant. F⃗ 2 has a magnitude of 6.40N and is directed

2. physics

In a dentist's office, an X-ray of a tooth is taken using X-rays that have a frequency of 7.01 1018 Hz. What is the wavelength in vacuum of these X-rays?

3. Math

Find the exact length of the curve. x = 5cost - cos5t, y = 5sint - sin5t, 0 < t < pi

4. Chemistry

Consider the following reaction. A(aq) (Two way arrows) 2B(aq) Kc = 7.94*10^-6 at 500K If a 2.70 M sample of A is heated to 500K what is the concentration of B at equilibrium?

5. Physics

One end of a uniform 3.20-m-long rod of weight Fg is supported by a cable at an angle of θ = 37° with the rod. The other end rests against the wall, where it is held by friction as shown in the figure below. The coefficient of static friction between the

6. Chemistry

For the following electrochemical cell Cu(s)|Cu2 (aq, 0.0155 M)||Ag (aq, 3.50 M)|Ag(s) write the net cell equation. I presume it is Cu + 2Ag^2+ --> Cu2+ + 2Ag Calculate the following values at 25.0 C using standard potentials as needed. Eocell = ? dGorxn =

7. Math

Skeletal remains had lost 84% of the C-14 they originally contained. Determine the approximate age of the bones. (Assume the half life of carbon-14 is 5730 years. Round your answer to the nearest whole number.)

8. Calculus

When a reservoir is created by a dam,50 fish are introduced into the reservoir ,which has an estimated carrying capacity of 8000 fish. A logistic model of the population is P(t)= 400,000 / 50 + 795e^-0.5t , where t is measured in years. How long does it

9. Chemistry

At a certain temperature, the Kp for the decomposition of H2S is 0.813. H2S (Two wa arrow) H2(g) + S(g) Initially, only H2S is present at a pressure of 0.280 atm in a closed container. What is the total pressure in the container at equilibrium?

10. Chem

1) Which solution will have the lowest OH- A) Na2CO3 B) NaHCO3 C) NaCl D) NaHSO4 E) NH4Cl 2) Which solution will be the strongest base? A) Na2CO3 B) NaHCO3 C) NaCl D) NaHSO4 E) NH4Cl 3) Which aqueous solutions are acidic? A) Na2CO3 and NaHCO3 B) NaCl and

11. mathematics

If Musa scored 75 in Biology instead of 57, his average mark in four subjects would have been 60. what was his total mark?

12. math

A rental agent is renting a space for \$7.50 a square foot. If you require a space 36 ft. by 16 ft., what will be the rental on that space?

13. Psychology

A hypothesis is an educated guess and as such must have the following characteristics: 1) can be proved or disproved 2) is based on some previous evidence 3) is an unsubstiantiated thought 4) is the basis of psychological research 5) all of the above 6) 1,

1.D 2.A 4.C 1.“Along the southern coast of Brazil the central plateau descends in high, steep escarpments. It towers over the waves and moves back in ridges, leveling off from the peaks of the coastal ranges … As it continues along to the northern

15. math

If the angle of declination is known, a surveyor would use_______ to find the length x. The cosine of a 50° angle is_______ this represents the value created when length x is divided by 90 feet. If the angle of declination changed to 60°, the cosine

16. Math

what is the degree of the polynomial 4x-2+5x^2?

17. Math

A radioactive substance decays according to the formula Q(t) = Q0e−kt where Q(t) denotes the amount of the substance present at time t (measured in years), Q0 denotes the amount of the substance present initially, and k (a positive constant) is the decay

18. statistics

Assume a binomial probability distribution has p = .60 and n = 200. a)What are the mean and standard deviation (to 2 decimals)? b)Why can the normal probability distribution be used to approximate this binomial distribution? c)What is the probability of

19. math

Use logarithmic differentiation to find the derivative of the function. y = (cos 2x)x

20. physics

A 3.1-µF capacitor has a voltage of 31 V between its plates. What must be the current in a 5.6-mH inductor so that the energy stored in the inductor equals the energy stored in the capacitor?

"THE thousand injuries of Fortunato I had borne as I best could, but when he ventured upon insult I vowed revenge. You, who so well know the nature of my soul, will not suppose, however, that gave utterance to a threat. At length I would be avenged; this

He had a weak point --this Fortunato --although in other regards he was a man to be respected and even feared. He prided himself on his connoisseurship in wine. Few Italians have the true virtuoso spirit. For the most part their enthusiasm is adopted to

23. math

a rope was 9.45 meters. the length of the first piece of rope was 1/5 of the original length. the second piece of rope was 0.12 meter longer than the third piece.how long was the second piece of rope

24. chemistry

the following values are the only energy levels of a hypothetical one electron atom: E6= -2x10^-19J, E4= -11x10^-19J, E2= -17x10^-19J, E5= -7x10^-19L, E3= -15x10^-19J, E1= -20x10^-1J a: if the electon were in the n = 3 level, what would be the highest

25. math

On a rectangular piece of cardboard with perimeter inches, three parallel and equally spaced creases are made (see Figure 1). The cardboard is then folded along the creases to make a rectangular box with open ends (see Figure 2). Letting represent the

26. English

Please correct me if I'm wrong on any of this thanks! From the words below supply the words that complete the sentences. Hypocritical, Homogenous, Piety, Pompous, Surmise, Susceptible, Validate, Catalyst. A. I said that he was POMPOUS because he pretends

27. math

Two angles are complementary. One contains 30° more than the other. Find both angles. The measures of the angles are _ degrees

28. Math

If you are given a conditional statement that you know is true, can you predict whether i) the converse is true? ii) the inverse is true? iii) the contrapositive is true?

29. math

When a stone is thrown upwards with an initial velocity of v metres per second, it reaches a maximum height of h metres. h is directly proportional to the square of v. Calculate the value of v when h = 50 Please help

30. psychology

A theory differs from a hypothesis in the following ways: Question 2 options: 1) they are proven hypotheses and are not subject to change 2) acts as a starting point for additional experiments 3) allows us to describe and explain observed behaviour 4) all

31. Physics 141

The drawing shows a bicycle wheel resting against a small step whose height is h = 0.125 m. The weight and radius of the wheel are W = 23.1 N and r = 0.330 m, respectively. A horizontal force vector F is applied to the axle of the wheel. As the magnitude

32. Physics

A 215-kg load is hung on a wire of length of 3.50 m, cross-sectional area 2.000x10^-5 m2, and Young's modulus 8.00x 10^10 N/m2. What is its increase in length?

33. Math

Can someone help me with this? Convert: 48lb/gal=____oz/qt

34. algebra

if 25% of A is equal to 48, then what is 2/3 of A?

35. English

if people object vociferously they are objecting in a very ________

36. Math

The surface area of a prism is 54 square inches. What is the surface area of a similar prism that is smaller by a scale of 1/3?

37. History

Circa the fifteenth century, the status of women was higher in southeast asia that it was in China, India, or Europe. Why was this so?

38. math

If a 1,000 unit vitamin D is equal to 10 glasses of milk how many glasses are in a 50,000 unit vitamin D?

39. Chemistry

Calculate the concentrations of all species in a 0.390 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8. Species: Na+ SO3 2- HSO3 - H2SO3 OH- H+ Thanks! The only thing I seem to

40. Math

How can you arrive at the distance between nail holes in string art. Mathematical concepts observed in string art

41. English

To look with admiration at someone or something is to ______ but to look at something very closely is to _____. If we seek to verify something, we are seeking to find out if what we heard _____. If you doubt someone's veracity, you doubt that he or she is

Hi, I really need help with this one. Determine the equation of g(x) that results from translating the function f(x) = x^2 + 3 upward 12 units Thank you.

43. occupational therapy

Mrs. Richards is a 79 year old widow who is in the skilled nursing facility secondary to a falling incident which injured her left shoulder. she has a history of rheumatoid arthritis which also impacts her active range of motion in bilateral upper

45. physics

A bomb of mass M at rest explodes into three pieces in the ratio 1 : 1 : 2. The smaller ones are thrown off in perpendicular directions with velocities 3 ms−1 and 4 ms−1. What is the velocity of the third piece after the explosion?

46. Statistics

The height of a certain species of a tree are normally distributed with a mean of 30ft and stand dev of 4ft. If a random sample of 16 of these trees is taken, what is the probability that the sample mean is less than 32fy?

47. Math

Convert- 94 gal/h=______L/min

49. mathematics

A man invested a sum of N280.00 partly at 59% and partly at 4%. If the total interest is N12.80 per annum, find the amount invested at 5%.

50. English

Help! Left my book in my locker and this assignment over George Orwell's novel 1984 are due this monday! My teacher gave us an assignment and the instructions are to find a quote from every chapter in part three and say how it shows Winston's downward

51. SAT math

A family of 2 parents and 4 children is eating lunch at a rectangular table with 2 chairs on each side and one chair on each end. In how many ways can they be arranged if the two parents sit in the two end chairs? a. 12 b. 30 c. 36 d. 48 e. 720

52. maths

Find the total surface area of a solid cone of radius 2√3cm and slanting side 4√3cm

53. Geometry

A certain Circle of paper has x degrees cut out of it. The two cut edges are taped together, curling the paper up into a right circular cylinder of height 8 and with a base of radius 6. What is the value of x? A) 74 B) 90 C) 120 D )144 E) 200

54. Biographical Essay Evaluation (Writeacher)

Revision of the second paragraph: "Leisure time is another one of my favorite things about summer. It brings me happiness beyond belief. It enables me to spend time with my family, to take part in the things they wish to do. It enables me to live life

55. Math

"If a quadrilateral is a rectangle, then it is a parallelogram." i) is the converse true? ii) is the inverse true? iii) is the contrapositive true?

56. physics

A brass ring of diameter 10.00 cm at 22.2°C is heated and slipped over an aluminum rod of diameter 10.01 cm at 22.2°C. Assume the average coefficients of linear expansion are constant. (b) What if the aluminum rod were 9.16 cm in diameter?

57. math

Evaluate the indefinite integral of the following function, e^sec2x sec2xtan2x dx

58. English

Put the following words in the correct place in these sentences. Revoke, Provoke, Invoke A. If we put something off until later, we _____ it. And something done for posterity is done for ____. If a Congressional Medal of Honor is awarded posthumously, it

59. maths

find the value of log49to7

60. CHEMISTRY

Write the net ionic equation for the reaction between potassium hydroxide and copper(I) nitrate.

61. Algebra

Maria and Charlie can deliver 50 papers in 2 hours. How long would it take them to deliver 35 papers? formula please

62. physical science

Provide three statements that demonstrate the importance of units when describing motion.

63. STATS

Suppose we are testing the null hypothesis H0: ì = 20 and the alternative Ha: ì 20, for a normal population with ó = 5. A random sample of 25 observations are drawn from the population, and we find the sample mean of these observations is = 17.6. The

64. math

Phosphorus-32 (P-32) has a half-life of 14.2 days. If 200 g of this substance are present initially, find the amount Q(t) present after t days. (Round your growth constant to four decimal places.) How fast is the P-32 decaying when t = 21.5? (Round your

65. Math

The growth rate of Escherichia coli, a common bacterium found in the human intestine, is proportional to its size. Under ideal laboratory conditions, when this bacterium is grown in a nutrient broth medium, the number of cells in a culture doubles

66. Chemistry

a solution is prepared by dissolving 50 g of calcium chloride in a 250ml volumetric flask which is then filled with distilled water up to the line-mark. Calculate the molar concentration of the solution.

67. Statistics

a procedure in REGRESSION NALYSIS WHERE PREDICTOR OR INDEPENDENT VARIABLES ARE CODED AS 1 OR 0 (REPRESENTING CATEGORIES) AND CAN BE USED TO PRODUCE ANOVA TABLES UNDER THE GENERAL LINEAR MODEL IS KNOWN AS?

68. Math

The length (in centimeters) of a typical Pacific halibut t years old is approximately f(t) = 190(1 − 0.955e−0.25t). How fast is the length of a typical 9-year-old Pacific halibut increasing? ? cm/yr (c) What is the maximum length a typical Pacific

69. Math

The percentage of a certain brand of computer chips that will fail after t years of use is estimated to be P(t) = 100(1 − e−0.12t ). What percentage of this brand of computer chips are expected to be usable after 3 years? (Round your answer to one

70. Math

During a flu epidemic, the number of children in the Woodbridge Community School System who contracted influenza after t days was given by the following. Q(t) = 7000 1+249 e−0.6 t (a) How many children were stricken by the flu after the first day? (b)

71. english writing

what is the best way to start a memoir about my first job experience? thank you

72. 6th Grade Science - Help

Which of Earth's spheres has the most mass? 1. atmosphere 2. hydrosphere 3. geosphere 4. biosphere Is it Biosphere?

Mike becomes angry when he can’t solve a mathematical problem, and slams his book down on the desk. Since his behavior is disruptive to his classmates, you wish to devise a scale by which you can gauge the impact it has on his fellow students. In doing

74. Pre calculus

Find all roots f(x)- x^3+2x^2-15x+30 Factor f(x) completely. I can't find any roots and always get a remainder with 1, -1, 2, -2 What do you do if you cannot find a root?? Using Calc button on ti84 I got X= -5.619 Y=1.4E-11 Still can't find zeros...

To find the ZPD of a given student,you should

76. Math

what is the degree of the polynomial 4x-2+5x^2?

77. Math

Identify the extraneous solution when solving √x+2= x

78. math

what does sin2x/cos2x equal to?

79. Math

Identify the extraneous solution when solving √x+2= x

80. Statistics

You take a trip by air that involves three independent flights. If there is an 67% chance each specific leg of the trip is on time, what is the probability all three flights arrive on time? (Round your answer to 3 decimal places.) Probability= ? My answer

81. physics

An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is S = 1.13 109 W/m2. What is the rms value of each of the following fields in the electromagnetic wave emitted by the laser? (a) electric field (b)

82. statistics

Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution

83. Grammar

Which version of this word is correct? School work or schoolwork?

84. statistics

Given that z is a standard normal random variable, compute the following probabilities (to 4 decimals). P(z -1.0) P(z -1.0) P(z -1.5) P(z -2.5) P(-3 < z 0)

85. English

1. Diurnal: nocturnal:: A. Warm: hot B. hot: cold C. Night: day D. Near: far Is it c? 2. Night: darkness:: A. Honesty: truthfulness B. sight: eye C. Height: fear D. Bravery: recklessness Is it a?

86. drama

In act 3, scene 1, who hears these words from titania? A. Bottom B. Oberon C. Peaseblossom D. Pick

1.D 2.A 4.C 1.“Along the southern coast of Brazil the central plateau descends in high, steep escarpments. It towers over the waves and moves back in ridges, leveling off from the peaks of the coastal ranges … As it continues along to the northern

88. Chemistry

what is the pH and pOH of a solution made by adding water to 15 grams of HCl until the volume of the solution is 2500mL?

89. Biographical Essay Evaluation (Writeacher)

Write a 3-paragraph Biographical Essay. Discuss your experiences with summmer: the things you enjoyed and the things you missed about school. I am beginning to simplfy my writting, as Bob suggested. However, I am going to sumbit the only the first

90. statistics

You are responsible for planning the parking needed for a new 256-unit apartment complex, and you are told to base the needs on the statistic “average number of vehicles per household is 1.9.” Which average (mean, median, mode) would be best if: •

91. English

1. Diurnal: nocturnal:: A. Warm: hot B. hot: cold C. Night: day D. Near: far Is it b?

92. college chemistry

Which base listed below would be the best to creat a buffer having a pH of 5.0230? hydrazine, Kb = 8.90e-7 methylamine, Kb = 3.70e-4 ethanolamine, Kb = 3.20e-5 pyridine, Kb = 1.40e-9

93. Chemistry

what is the pH and pOH of a solution made by adding water to 15 grams of HCl until the volume of the solution is 2500mL?

94. Physics

Acceleration due to gravity is independent of mass, but the force is not. Determine the final velocity of the following objects and the force generated by the same objects as they are dropped from the given heights. 10 kg 2.5 meters 7 kg 5.5 meters 0.5 kg

95. History

The Missouri Compromise settled one dispute, but contained a provision that began another battle

96. Civil War

3.) The issue of the Mexican War divided the North and South

97. English

Please correct me if I'm wrong on any of this thanks! From the words below supply the words that complete the sentences. Sumptuous, Homogeneous, Surreptitious. A. Despite their many differences, the population was a HOMOGENOUS group that, at bottom,

98. English

Please correct me if I'm wrong on any of this thanks! From the words below supply the words that complete the sentences. Capitulate, Caustic, Hierarchy, Iconoclast, Placid. A. While he enjoyed the work, the rigid CAUSTIC in the company meant his

1. list three example of verbal irony and explain how each contribute to the suspense and sinister tone of the narrative *Verbal Irony - Fortanato toasts "to the buried that repose around us" *, “My dear Fortunato, you are luckily met.” However, he

100. ENGLISH

Please correct me if I'm wrong on any of this thanks! From the words below supply the words that complete the sentences. Capitulate, Caustic, Hierarchy, Iconoclast, Placid. A. While he enjoyed the work, the rigid HIERARCHY in the company meant his

101. English help

Put the following words in the correct place in these sentences. Revoke, Provoke, Invoke A. If we put something off until later, we REVOKE it. And something done for posterity is done for PROVOKE. If a Congressional Medal of Honor is awarded posthumously,

102. Biographical Essay Evaluation (Writeacher)

My second paragraph: "Free time is another one of my favorite things about summer. Not being preoccupied by some kind of assignment or curricular activity brings me happiness beyond belief. It enables me to spend time with my family, to take part in the

1.D 2.A 4.C 1.“Along the southern coast of Brazil the central plateau descends in high, steep escarpments. It towers over the waves and moves back in ridges, leveling off from the peaks of the coastal ranges … As it continues along to the northern

104. Biographical Essay Evaluation (Writeacher)

Third paragraph: "Nevertheless, despite my love for summer freedom, there are a couple of things I missed about school. Learning new and self-improving information, for instance, is one of them. How relieved I remember feeling when my teacher, Mrs.

105. Biographical Essay Evaluation (Writeacher)(All)

This is my entire, revised essay. "A strong sense of freedom is one of my favorite things about summer. My freedom in summer lessens stress. It protects me from the pressure of incomplete schoolwork. It shields me from the worry of disappointing grades and

106. Physics 141

x=3.5Cos(8pi.t) Amplitude=3.5m What is the frequency?

107. Physics 141

x=3.5cos(8pi.t) Amplitude=3.5m Frequency?

108. Science

Give 2 examples for sources of electricity?

109. college chem

What would the [OH-] be after addition of 17.47 mL of 0.1000 M NaOH to 25.00 mL of 0.1000 HA (a weak acid, Ka = 3.16e-4)?

110. Physics 141

A bicycle wheel resting against a small step whose height is h = 0.125 m. The weight and radius of the wheel are W = 23.1 N and r = 0.330 m, respectively. A horizontal force vector F is applied to the axle of the wheel. As the magnitude of vector F

These questions regard the essay "Georgia O'Keeffe" by Joan Didion. 1. What do the words "style is character" mean? A: This saying merely means that an artist's character is responsible for his or her artistic choices. 2. Explain how the statement is

112. math

Take west to be the positive direction. The height of a sloped roof above the place where I stand is h = 12 feet (see the figure below). If I move 3 feet west, the height is 10 feet. If I move 2 additional feet west, what is the height of the roof above

113. Grammar

The following senetences are inverted. Write C if the subject-verb agreement is correct. Write I if the subject-verb agreement is incorrect. Then, on the line following each sentence, write the correct form of the verb. 1. Was Lyndon Johnson the next

114. Grammar

Rewrite the paragraph, correcting all errors in subject-verb agreement. In this article about Arthur Ashe, there is several stories about the tennis player's inner strength. Here is some examples: Ashe did not let the other players know what he was